package com.kecheng.com.utils;

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class BeanHelper {
    static Log log = LogFactory.getLog(BeanHelper.class);

    /**
     * 复制非空属性
     *
     * @param src
     * @param target
     */
    public static void copyNonNullProperties(Object src, Object target) {
        BeanUtils.copyProperties(src, target, getNullPropertyNames(src));
    }

    /**
     * 获取对象空属性集合
     *
     * @param source
     * @return
     */
    public static String[] getNullPropertyNames(Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
        Set<String> emptyNames = new HashSet<String>();
        for (java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            log.debug("update:" + pd.getName() + "--" + srcValue);
            if (srcValue == null) emptyNames.add(pd.getName());
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }

    public static <T> List<T> listMapToBean(Object obj, Class<T> clas) {
        String json = JSONObject.toJSONString(obj);
        return JSONObject.parseArray(json, clas);
    }
}